As per a request on this site! Based on a 737-200 that was part of their fleet. Not to be confused with the currently operational Frontier Airlines.
Frontier Airlines was an American airline formed by a merger of Arizona Airways, Challenger Airlines, and Monarch Airlines on June 1, 1950. Headquartered at Stapleton Airport in Denver, Colorado, the airline ceased operations on August 24, 1986. A new airline was founded eight years later in 1994 using the same name.
Simply extract and drag/drop into your Community folder!
Enjoy!
If you feel so inclined to donate - https://www.paypal.com/paypalme/ahsaul
ahsaul 
Thanks for doing this one. I really love the old liveries from the 70s and 80s. The quality of the work you did hear is excellent. Thanks again for all of your contributions!
2 years ago
cnewman2832
First of all, incredibly nice work! Minor problem: I use the FBW version of the a320, and their installer generally has zero problems automatically converting liveries. It seems to be having a hiccup with this livery however and I get an error message. Any thoughts on a fix?
2 years ago
C0SM0S
Unable to install as I get a message when trying to drop in the community folder saying "Destination path too long" and it shows this folder "TEXTURE.frontier-retro"
I tried shortening the file name but the aircraft does not show in the liveries
2 years ago
Yeah, shortening the name will mean its not mapped correctly. I would suggest extracting the file directly into your Community folder. I tested that and it extracts just fine that way.
2 years ago
ahsaul
magicands
Excellent work. Precise with very nice metal work on nacelles and wings, and tasteful 'dirt' not overdone. Thank you for sharing with us, will be using this one frequently.
2 years ago
fuzz1